Electric heater.



G. A. ARNULD.

ELECTRIC HEATER.

AYPLIGATION FILED MAB.19,1913.

Patented Apr. 14, 1914i,K

vnNITED STATES PATENT OFFICE,

GEORGE A. ARNOLD, oii` MInDLEToWN, CONNECTICUT, lAssrefNon ro ARNoLp ELEC- 'Tza'x'c COMPANY, A CORPORATION oF MASSACHUSETTS.

ELECTRIC HEATER.

Specification of Letters Patent.`

Patented Apr. 14, 1914.

Application filed March 19, 1913. Serial No. 755,304.

and State of Connecticut, have invented a certain new and useful Electric Heater, of which the following is a specification, reference b'eing had to the accompanying draw ings, forming part thereof.

This invention has reference to improvements in electric heaters or plug heaters, so calledfor the intake pipes of combustion engines One object 4of the vinvention is to so construct an electric heating device of this nature that its heating or resistance element may be readily applied, within* a pipe, to the terminals of both arms of an electric circuit'without distorting said heating element.

Another object of the invention' is to provide an electric heating device for the intake pipe ofan engine so that the heating or resistance element shall be included in the main electric circuit Vas distinguished from such an element forming part of a grounded circuit.

Another object of the invention is to in iprovethe plugs or supports for the electric heating element.

Other objects of the invention will appear from the following description; 1 A

The invention consists in the novel heating element and in the means fnsustaining said element in the intake pipe.

The invention also consists in such othe novel features of construction and combination of parts as shall hereinafter be more fully described and pointed out in the claims.

Figure l, represents a view of portions of an engine intake pipe partially shown in section to illustrate the improved electric heating device applied to said pipe. Fig. 2, represents a sectional view taken on line 2 2 of Fig. 1. Fig. 3, represents a similar view taken on line 3-3 of Fig. 1.

Similar characters of reference designate correspondingr parts throughout. f'

As shown in the drawings in its preferred form the electric heating or electric resistance element 5 is sustained within the pipe A, which is the -ordinary intake pipe of a combustion engine, by a pair of terminals both electricallyv insulated from the wall o? said pipe and forming part of or electrically connected with the metallic-arms of4 the electric .circuit a: which circuit also includes a battery b or other source of electric energy. In the more specific embodiment of my invention, herein shown, I employ a pair of plugs each having the tubular casing 6 screw `threaded on' its exterior and having an internal screw threaded socket which terminates 'at the shoulder 7 from which point the bore ofvsaid casing 6 toits inner end is of reduced diameter.

from is the terminal or conductor 8 having the wall 9 of suitable electrical insulation which is provided with an enlargement 10Y which is secured between the shoulder '7 of said casing andthe screw threaded collar or bushing 11 which screws into the threaded socket of said casing. AThe outer'vend 12` ofterminal 8 has the wire binding device 13 screwed thereon while the inner end. 14 of said terminal has the sleeve 15 rotatable on and in alinement therewith, the-distance between said holes bein determined .by the length of the heating e ement 5-and, also, by the desired distention of such elementi;

Element 5, in its preferred form, is a'wire of iron or other resistance material wound in spiral shape, the ends having hook shaped members 5', 5. The diameter of the coil of this member 5 is such, preferably, that it may pass through the hole c but aside from such provision the diameter of said coil is preferably large enough as compared with the inner diameter ofpipe A to insure the fluid passing through said pipe coming in contact with said ember 5.

One ofthe hook members 5 of the heating element 5 is engaged with the grooved enlargement 16 of sleeve 15 of one of the' lugs and element 5 is passed endwise throng the casing of the plug to which said element 5 is 11o Y be drawn to distend said element 5 and said mirialg.,A If the casi end' 5 may be hooked onto the grooved enlargement 16V of the sleeve 15` of `said ter- 0' 6 of this plug, for hole d, has been remove such casing is now replaced and the terminal 8 is secured in place therein by screwing in the bushing 11 and the casing 0f this plug is then screwed into lthe hole il. It is to be noticed that the' screwing into place of the plug casings does not a'ect'or distort the element 5 owing to the' fact that the ends 14, 14 of the respective terminals 8,; 8 are' free to rotate in their sleeves 15, 15. y j

By connectin both v4ends oat the heating velement coil5 'directly with the mains of v'circuit :hay lwaste vo .current` is less than -where one end of the heatin element is grounded through the ipe'5 an' itis found-thatfpurc hasers-ql'stpiI y1 prefer's'u'ch direct xjnnecf' tions as simplifying the .electrical circuits for* testin and tracinifi" f As. e heating e ement 5.is held distended heated 4may pas" therebetweenI-,while the holding of element under such distention'permits it to readily vibrate, due to the vibration -of the engine, so that its heat is more eiectually radiated to the vapor passing through said pipe.

I Having thus described my invention. I claim as new and desire to secure by Letters Patentv 1. An electric heater comprising a pipe havingv a pair of openings spaced apart, a pair of bushings removably fitting said openings, terminals mounted in said bushings, and an electric heatin element of less diameter than one of sai saidterminals whereby said heating element Y may beintroduced through one of said openlngs.

pair of bushings removably fitting said openings, terminals mounted Ain said bushings, and a spiral distensible heating coil' of less diameter than one'of said` openings connected at' its ends to said terminals whereby.V one of said terminals and its bushing may be to permit t the other of said openings.y y GEORGE A. ARNOLD. *5' Witnesses: Y i 'Y 'H Es'rrmn C. MURPHY.v

Copies of vpatentv may be Yobtaintladf*for i've cents each, by addressing the Commissioner o! Patents, 'l Y 'l washington, D. c." l

openings carried byl2. An electric heatercomprising a pipe l having a pair of openings'spaced apart, a

removed and said Lcoil distendedjto permit. the disenga ement thereof from its terminal? he removal of said coil with thev other'of its terminals andbushings.throughv 

